feat: implement internationalization with multi-language support and runtime language selection

src/app/components/calendar-year/calendar-year.html

@@ -6,7 +6,7 @@
 					<mat-spinner [mode]="'determinate'" [value]="loadingProgress()"></mat-spinner>
 					<div class="spinner-text">{{ loadingProgress() }}%</div>
 				</div>
-				<p>Calcul en cours...</p>
+				<p>{{ tr().loading }}</p>
 			</div>
 		</div>
 	}